Dropbox is a cloud-based file storage and synchronization service. It allows users to store and access their files from multiple devices, including computers, smartphones, and tablets. Dropbox uses a freemium business model, where users can access the basic features for free, but need to pay for additional storage and advanced features. Dropbox was founded in 2007 and has grown to become one of the most popular cloud storage services, with over 500 million users as of 2021. It is known for its simplicity and ease of use, which has made it a popular choice among individuals and businesses alike.